SML2120 datasheet(14/32 Pages) SUMMIT

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Applications Information

SML2120

2066 6.3 1/22/04

Summit Microelectronics

Device configuration and access is simplified using the

SML2120 graphical user interface (GUI) software available

from the Summit website (www.summitmicro.com). This

software utilizes a programming dongle (SMX3200)

connected to the parallel port of a PC to read and write the

device.Compatible Laser Drivers

Compatible Laser Drivers

The SML2120 is compatible with a wide array of laser

drivers from many different manufacturers. The SML2120

controls the power, biasing and modulation current

independent of the data rate of the laser driver. Therefore, it

can be applied with drivers that operate at sub-GHz,

2.5GHz, 10GHz and 40GHz rates. An example application

for an electro-absorptive modulated laser is shown in

Figure 8. The SML2120 interfaces to the laser module

thermistor, monitor diode and laser diode to control bias and

modulation levels over temperature.

Another application example is shown in Figure 9. Here,

the SML2120 is shown controlling a laser diode and an

external thermistor. The thermistor output is monitored and

also buffered to drive the external temperature pin which is

connected to one of the LUTs on the SML2120. Also shown

are the optional connections for dual supply operation and

connections to the SMX3200 programmer header.

Table 4. SML2120 Access Types

Slave

Address

(Address bit 8)

Access Type

1001

Read/Write Status registers

Read A/D converter

1010

General Purpose E2PROM

Configuration registers

1011

Read/Write Lookup Table 0

Read/Write Lookup Table 1

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